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26                                         FLORA   INDICA,
fects of local circumstances and temporary associations, which
give a foreign colouring to everything surrounding them
The following remarks on the relation between climate and
the development of species in India, though crude, may proves
suggestive to, those enabled to pursue this subject. Although
India presents greater contrasts of nlimatc than any-other area
of equal size in the world, we do 110$ find that those genera and
species, wnich prevail over all its parts, arc so variable m any
respect as arc the plants of some Countries which enjoy a more,
uniform climate\ as an example, we may say that the speeies
farimng the flora of New Zealand are, as a whole (proportion-
ately to the extent of the flora), far more variable than those
of the mountains or plains of India, Could this fact be ex-
panded, and, being confirmed in a wirier survey, be proved to IKJ
of general application, it would be one of the most important
data to start from in the investigation <>f those laws that regu-
late the development of varieties; but we arc* not prepared to
say that a comparison of the sjxieies which inhabit the e\ees-
sivc climatgs of different parts of India with thus* that inhabit
the uniform climates,'supports this view: for mstauee, the
central or temperate regions of the Himalaya, where perennial
humidity and coolnea* prevail, are not peopled by very variable
genera and species, whilst the alpine regions that we eharacs
terfajfcd by an excessive climate are so, and the animals of the
htit plains are peculiarly sportive iu stature, habit, hairimma,
foliage., and number and form of their smaller organs.
Another point, intimately connected with the question of
the power of climate in producing change in speeie*, is the
relation that exists tyetwcwi the climate of an urea, u*al the
ntfr&ber of species that inhabit it; and this afford* a fertile
a^d most interesting field of inquiry in India, when; so many
climates may be met with in a comparatively limited urea. A
few facts have appeared to us worthy of notice, though an yet
far from well established: as that the equable elimate met w ith
on the cool parts of the Khasia mountains and temperate re*
gions of the Himalaya, and on the hot humid count,* of Uetigol